I found a 5 gallon aluminum pot at my inlaws. They said I could definitely use it if I wanted to my question is should I use in aluminum pot which is free or go out and buy a stainless steel pot? I am a new Brewer and just spent a decent amount of cash on supplies would the aluminum pot work at least temporarily?

The only thing to be aware of: if the aluminum pot has not been used yet, make sure to boil water in it prior to brewing with it. This will build up a darker oxidation layer that is an important buffer. You want that oxidation layer in place; it prevents the aluminum from leaching into your brew. And, when cleaning your pot after brew day, DO NOT SCRUB IT! Gently wipe it clean, leaving that oxidation layer intact, and you'll be good to go!

BOUSIRIS BOUERY - Home of the Zyme LordThe cans of Leinenkugel's had masking tape on them with JOHN'S printed in ink. Amy looked around me and said, "John is protective about his beer, isn't he?"
"I put that label on there. When company comes I want them to know the Leinie's is his, not mine." - David Wong